My cnc minilathe
- willburrrr2003
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This was done with my first g-code program running, just a simple facing cut but I am happy to be learning fast and getting better with the machine and making the machine better too. If you can see the point on the end of the work piece, that is not supposed to be there. Turns out I was loosing steps on the x-axis due to a setting on my controller board. I have fixed that problem I think, and will know when I get my tool post mod done and mounted back on the cross-slide. I got rid of the compound piece of the compound cross-slide, so that I could turn larger materials on the lathe. I can comfortably turn 4" roundstock with the mod I am doing...and just happen to have 4" roundstock ready to make a fly reel once up and running....
Regards,
Will
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Can I just point out that that is an awful lot of workpiece protrusion, and also an awful lot of tool protrusion? Typically you would try to cut a lot closer to the chuck, and a lot closer to the toolpost.
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- willburrrr2003
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Regards,
Will
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(But bear in mind that I have no formal machine-shop training either).
You will find that if the work sticks out too far you will tend to get a taper, as the work deflects more away from the chuck than near it. You are also likely to get chatter.
If you don't have the tailstock adjusted right, though, that will tend to force a taper too. Tailstocks are generally adjustable at right-angles to the bed specifically to allow the turning of shallow tapers. (That does involve turning the old-fashioned "between centres" way).
If you are machining a thick bar down to a long, slender diameter then something that you can do with CNC is do a series of very short operations, at the extreme that would be machining to a diameter with a sequence of facing cuts which stop short. That way the slender diameter is always supported by the remaining material.
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- willburrrr2003
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I started at 0.0, and issued the home command. The switch triggers at 1.0, then it backs off to 0.0. My other limit switch triggers at -9.085, should I set my axis travel to be just shy of the switch...or at the point the switch trips (....z table dimensions are -9.0 to 1.0 or z table dimensions are -9.085 to 1.0) ?
Regards,
Will
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Can u know the limit trip time for that machine running to shop..
Sorry old chap, I don't quite follow your banter.
Could you consider rephrasing the question?
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- willburrrr2003
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Will,
Looking good... I can't tell but it looks like your limit switch is mounted so that in case of over travel it might be damaged.
In this photo of an over simplified lathe set up you can see that the carriage can travel to the limits without damaging the switch.
John
Yes they are positioned where if an overtravel ocurred then the switch could / would be damaged. I figured that 1) the hard limit would prevent the over-travel, and 2) the Soft limits would prevent the travel reaching the limit switch. and with these two conditions in place that the possiblity of crashing into my limit switches would be extreamly slim.... I can look into re-mounting as you showed in your example, as it would be a better way of doing the same funtion...
Regards,
Will
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John
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